mjsax commented on code in PR #18258:
URL: https://github.com/apache/kafka/pull/18258#discussion_r1984233834


##########
docs/streams/upgrade-guide.html:
##########
@@ -1735,73 +1735,38 @@ <h3 class="anchor-heading"><a 
id="streams_api_changes_0101" class="anchor-link">
 
     <h3 class="anchor-heading"><a id="streams_api_broker_compat" 
class="anchor-link"></a><a href="#streams_api_broker_compat">Streams API broker 
compatibility</a></h3>
 
-    <p>The following table shows which versions of the Kafka Streams API are 
compatible with various Kafka broker versions.</p>
+    <p>The following table shows which versions of the Kafka Streams API are 
compatible with various Kafka broker versions. For Kafka Stream version older 
than 2.3.x, please check <a href="/39/documentation/streams/upgrade-guide">3.9 
upgrade document</a>.</p>
 
     <table border="1" class="non-scrolling-table docutils">
         <thead>
           <tr>
             <th></th>
-            <th colspan="5">Kafka Broker (columns)</th>
+            <th colspan="2">Kafka Broker (columns)</th>
           </tr>
         </thead>
         <tbody>
           <tr>
             <td>Kafka Streams API (rows)</td>
-            <td>0.10.0.x</td>
-            <td>0.10.1.x and 0.10.2.x</td>
-            <td>0.11.0.x and<br>1.0.x and<br>1.1.x and<br>2.0.x</td>
             <td>2.1.x and<br>2.2.x and<br>2.3.x and<br>2.4.x and<br>2.5.x 
and<br>2.6.x and<br>2.7.x and<br>2.8.x and<br>3.0.x and<br>3.1.x and<br>3.2.x 
and<br>3.3.x and<br>3.4.x and<br>3.5.x and<br>3.6.x and<br>3.7.x and<br>3.8.x 
and<br>3.9.x</td>
             <td>4.0.x</td>
           </tr>
           <tr>
-            <td>0.10.0.x</td>
+            <td>2.4.x and<br>2.5.x</td>
+            <td>compatible with exactly-once v2 turned off</td>
             <td>compatible</td>
-            <td>compatible</td>
-            <td>compatible</td>
-            <td>compatible</td>
-            <td></td>
           </tr>
           <tr>
-            <td>0.10.1.x and 0.10.2.x</td>
-            <td></td>
-            <td>compatible</td>
-            <td>compatible</td>
-            <td>compatible</td>
-            <td></td>
-          </tr>
-          <tr>
-            <td>0.11.0.x</td>
-            <td></td>
-            <td>compatible with exactly-once turned off<br>(requires broker 
version 0.11.0.x or higher)</td>
-            <td>compatible</td>
-            <td></td>
-          </tr>
-          <tr>
-            <td>1.0.x and<br>1.1.x and<br>2.0.x and<br>2.1.x and<br>2.2.0 
and<br>2.2.0</td>
-            <td></td>
-            <td>compatible with exactly-once turned off<br>(requires broker 
version 0.11.0.x or higher);<br>requires message format 0.10 or 
higher;<br>message headers are not supported<br>(requires broker version 
0.11.0.x or higher<br>with message format 0.11 or higher)</td>
-            <td>compatible; requires message format 0.10 or higher;<br>if 
message headers are used, message format 0.11<br>or higher required</td>
-            <td>compatible</td>
-            <td></td>
-          </tr>
-          <tr>
-            <td>2.2.1 and<br>2.3.x and<br>2.4.x and<br>2.5.x and<br>2.6.x 
and<br>2.7.x and<br>2.8.x and<br>3.0.x and<br>3.1.x and<br>3.2.x and<br>3.3.x 
and<br>3.4.x and<br>3.5.x and<br>3.6.x and<br>3.7.x and<br>3.8.x 
and<br>3.9.x</td>
-            <td></td>
-            <td></td>
-            <td>compatible; requires message format 0.11 or 
higher;<br>enabling exactly-once v2 requires 2.5.x or higher</td>
+            <td>2.6.x and<br>2.7.x and<br>2.8.x and<br>3.0.x and<br>3.1.x 
and<br>3.2.x and<br>3.3.x and<br>3.4.x and<br>3.5.x and<br>3.6.x and<br>3.7.x 
and<br>3.8.x and<br>3.9.x</td>
+            <td>compatible; enabling exactly-once v2 requires broker version 
2.5.x or higher</td>
             <td>compatible</td>
-            <td></td>
           </tr>
           <tr>
             <td>4.0.x</td>
-            <td></td>
-            <td></td>
-            <td></td>
-            <td>compatible; enabling exactly-once v2 requires broker version 
2.5.x or higher</td>
+            <td>compatible</td>

Review Comment:
   Given that KS 4.0.x does not include EOSv1 any longer, we should also call 
this out? KS 4.0 with EOSv2 does require broker 2.5+ too.
   
   Given that we don't have EOSv1 in KS 4.0 any longer, we could say "enabling 
exactly-once requires broker version 2.5.x or higher" (ie, drop the `v2` thing).
   
   Or: we just merge 4.0 row with `2.6.x - 3.9.x` row?



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